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cross compiler hello

Install ARM cross-compiler on ubuntu machine and use it's for hello world

#cross-compiler  

Table of Content

A cross compiler is a compiler capable of creating executable code for a platform other than the one on which the compiler is running (wikipedia)

install cross compiler#

install crosscompiler tools
sudo apt install crossbuild-essential-arm64

toolchain setting file#

aarch64-linux-gnu-toolchain.cmake
set(CMAKE_SYSTEM_NAME Linux)
set(CMAKE_SYSTEM_PROCESSOR "aarch64")
set(CMAKE_C_COMPILER aarch64-linux-gnu-gcc)
set(CMAKE_CXX_COMPILER aarch64-linux-gnu-g++)
set(CMAKE_CUDA_COMPILER nvcc)
set(CMAKE_CUDA_HOST_COMPILER aarch64-linux-gnu-gcc)
set(CMAKE_FIND_ROOT_PATH "/usr/aarch64-linux-gnu")

set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)

demo#

├── aarch64-linux-gnu-toolchain.cmake
├── build
├── CMakeLists.txt
└── src
    └── hello.cpp

code#

#include <iostream>

int main(){
    std::cout << "hello cross compiler" << std::endl;
    return 0;
}

cmake_minimum_required(VERSION 3.15)
# Toolchain settings
set(CMAKE_TOOLCHAIN_FILE aarch64-linux-gnu-toolchain.cmake)

project(CrossCompiler_demo)

add_executable(hello_cc src/hello.cpp)

Warning

It is crucial to set the value of CMAKE_TOOLCHAIN_FILE before project() is invoked, because project() triggers toolchain detection and verification.

cmake gui#

  • using cmake gui
  • set cross compiler settings from file

make, check, run#

make#

  • Run make from build folder
  • Check executable arch with file command
  • Run with qemu or Copy to embedded device

check#

cd build
# Result
file hello_cc 
hello_cc: ELF 64-bit LSB shared object, ARM aarch64, version 1 (SYSV), dynamically linked, interpreter /lib/ld-linux-aarch64.so.1, BuildID[sha1]=5425e3fd790ba1a6a07c4963f0606a58edf53aa7, for GNU/Linux 3.7.0, not stripped

run#

Run ARM binary using qemu

sudo apt-get install qemu-user-static

# from build folder
qemu-arm-static -L /usr/arm-linux-gnueabihf ./hello_cc

Ref#